R-82 Slice D/E: installer default 1.20.0 + architecture docs brought current

Slice D.1 — host-install 1.20.0: a FRESH box defaults to local-daily +
offsite-weekly (felhom-pbs, 604800s, keep_last=2). setdefault semantics proven
both ways: fresh gets the tier, an UPGRADE preserves the existing backup block
verbatim — so an in-place upgrade can never silently start writing to an
offsite datastore. Existing boxes are migrated explicitly.

Slice E:
- 07-backup-architecture.md: honest status header per CONTEXT ruling S-2, with
  an explicit STALE-outside-the-PBS-tier verdict (the controller tiers were last
  verified 41 controller versions ago). The PBS row claimed 'PBS on DooPlex'
  (the retired spike store) with no cadence; it now names felhom-pbs ->
  felhom-offsite on ep0 over wg-felhom, weekly, keep_last=2. NOT marked
  ratified — that is Viktor's review of the section 10 list. Discharges R-83.
- 06-offsite-connectivity.md: the target-split remaining-work note collapsed
  (shipped), and records HOW S4.1's tier-aware timeout silently regressed — the
  mechanism was never removed, its INPUT changed when local_backup_target was
  retargeted to 'local'. Also notes S4.1 already diagnosed the teardown 403 as a
  phantom (a timeout consequence, not an ACL gap).
- capability map: new row for recurring offsite backups actually LANDING, as
  distinct from the existing row proving ACTIVATION. IMPLEMENTED, not
  PROVEN-LIVE — the restore round-trip has not completed under the fixed code.
- ROADMAP: R-82 SHIPPED with its remaining gate named, R-83 DISCHARGED, R-84
  left open.
- CONTEXT + REPORT: the arc, including the mid-arc correction I had to make.

documentation/architecture/06-offsite-connectivity.md

@@ -321,7 +321,9 @@ vantage (Peti VM 110) remains the thorough confirmation but no longer gates anyt
 | **S1 — endpoint provisioning + peer-sync surface** — **SHIPPED 2026-07-04** (dev endpoint; hub v0.32.1). Peer-sync design point RESOLVED: **hub pushes over SSH** (`x/crypto/ssh`, `FixedHostKey` pin + pinned-type `HostKeyAlgorithms`) to a forced-command reconcile script; runbook `documentation/runbooks/offsite-endpoint.md`. Done-criterion met live: hub add/remove → `wg show` on the endpoint; tunnel `ep0.felhom.eu:443` → PBS through the wg0-only 8007 rule. | ~~provision the production VM…~~ (see runbook; production endpoint = a later re-run) | hub can add/remove a peer on the live endpoint via its credential; runbook re-creates the VM from nothing ✓ |
 | **S2 — hub schema + desired-state** — **SHIPPED 2026-07-04** (hub v0.33.0). `POST /hosts/{id}/wg` (self-scoped) + merge-at-read `wireguard` block (§3.2 shape = the golden) + one-per-host index + re-key-in-place + `/offsite` UI page. Live-proven against the real felhom-pve record incl. old-agent (v0.63.0) tolerance. | ~~endpoint coords + peer registry…~~ | a registered box's desired-state carries its assignment ✓; hub UI shows the peer registry ✓ |
 | **S3 — agent WG service (the agent-managed-unit pilot)** — **SHIPPED 2026-07-04** (agent v0.64.0; `wg_tunnel.enabled` DEFAULT FALSE until the production endpoint exists). `internal/wgtunnel`: keygen → marker-gated registration → `wg-quick@wg-felhom` reconciled from the served `wireguard` block (restart-not-reload; hash-gated zero-exec steady state); **revocation completed §3.5**: block absent from a PRESENT desired-state → disable + marker kept + never re-register (operator re-adds via the reported pubkey); absent DATA never tears down. `FELHOM_WG` sudoers (latest-handshakes is the ONLY wg read — `dump` leaks the private key); `IdentityBundle.WGPrivateKey` (pre-S3 blobs can't be retrofitted — S5 falls back to fresh-key re-register, /32 kept); report stanza = §4.6's tunnel-health input. Endpoint re-resolution: wg-quick resolves at unit (re)start; the manager restarts on conf change and the operator path covers re-IP (full §4.2 watchdog → S6 with tunnel-health alerting). Live on felhom-pve: up in 3 s, reboot-persistent, revocation drill, 30-min soak. | ~~keygen + registration…~~ | fresh box joins by §3.3 end-to-end ✓; tunnel survives agent restart + host reboot ✓; unhealthy-tunnel ALERTING → S6 (stanza shipped) |
-| **S4 — PBS over the tunnel — SHIPPED 2026-07-04** (agent v0.65-0.67; runbook §4a/§4b). Endpoint per-customer tenancy (ns + privsep `DatastoreBackup` token, dual-grant user+token on `/datastore/<ds>/<ns>`, cross-tenant 403); box `felhom-offsite` PVE storage `Server=10.77.0.1`, box-born encryption key, token-secret WARN fix, `local_backup_target` retarget; agent **v0.66.0** v4-pin + re-resolve watchdog + FELHOM_WG Critical, **v0.67.0** namespace-aware PBS client. | ~~point the box's PBS storage at `pbs_tunnel_ip:8007`~~ | real vzdump of 9201 lands as ciphertext in ns over the tunnel ✓; ns-scoped verify=ok under the box's own token ✓; WARN gone ✓; restore decrypts with the box-born key ✓. Follow-ups: ~~restore-test scheduler WAN deadline + scratch `VM.Allocate`~~ **RESOLVED S4.1 (agent v0.68.0)** — tier-aware restore-task timeout (pbs→120m, local→10m); the offsite restore-test now runs unattended on the agent-token path (`pass:true`, teardown clean). The `VM.Allocate` item was a **phantom** — the earlier 403 was the 10m-timeout consequence (guest not yet in `/pool/felhom`); no ACL change. Remaining: Tier-1-local-vs-Tier-2-offsite target split (`local_backup_target` is a single target; the ~30-min controller cadence makes offsite-as-default near-continuous). |
+| **S4 — PBS over the tunnel — SHIPPED 2026-07-04** (agent v0.65-0.67; runbook §4a/§4b). Endpoint per-customer tenancy (ns + privsep `DatastoreBackup` token, dual-grant user+token on `/datastore/<ds>/<ns>`, cross-tenant 403); box `felhom-offsite` PVE storage `Server=10.77.0.1`, box-born encryption key, token-secret WARN fix, `local_backup_target` retarget; agent **v0.66.0** v4-pin + re-resolve watchdog + FELHOM_WG Critical, **v0.67.0** namespace-aware PBS client. | ~~point the box's PBS storage at `pbs_tunnel_ip:8007`~~ | real vzdump of 9201 lands as ciphertext in ns over the tunnel ✓; ns-scoped verify=ok under the box's own token ✓; WARN gone ✓; restore decrypts with the box-born key ✓. Follow-ups: ~~restore-test scheduler WAN deadline + scratch `VM.Allocate`~~ **RESOLVED S4.1 (agent v0.68.0)** — tier-aware restore-task timeout (pbs→120m, local→10m); the offsite restore-test now runs unattended on the agent-token path (`pass:true`, teardown clean). The `VM.Allocate` item was a **phantom** — the earlier 403 was the 10m-timeout consequence (guest not yet in `/pool/felhom`); no ACL change. ~~Remaining: Tier-1-local-vs-Tier-2-offsite target split~~ **SHIPPED 2026-07-26 (R-82)** — agent v0.97.0 gave `BackupConfig` per-target tiers (`backup_targets[]`, each with its OWN cadence + retention), controller v0.174.0 reconciles them into ONE quiesce window, hub v0.76.0 judges each tier against its own threshold, host-install 1.20.0 defaults a fresh box to local-daily + offsite-weekly. Live: local 24h + `felhom-pbs` 168h on both demo boxes.
+
+> ⚠️ **S4.1's tier-aware timeout silently REGRESSED and was restored 2026-07-26 (agent v0.100.0) — the mechanism was never removed, its INPUT changed.** S4.1 derived the tier with `storageTier(BackupTarget())`, which was correct while `local_backup_target` **was** `felhom-pbs`. The target split above retargeted it to `"local"`, so a `felhom-pbs:` archive was thereafter classified **local** and got the 10-minute bound again — reproducing the S4.1 symptom exactly (wait expires mid-restore → teardown fires at a not-yet-pool-associated guest → the same `403 missing privilege VM.Allocate`, and the same **phantom** reading of it). v0.100.0 derives the tier from **the archive's own storage** (`restoreTierForArchive`), which is input-independent. The lesson is not "add a timeout" — it was already there — but that a fix keyed on *"the configured target"* stops holding the moment more than one target exists. |
 | **S5 — DR re-establishment — SAFE HALVES SHIPPED 2026-07-04 (agent v0.69.0); destructive drill operator-gated.** Part 1: `wgtunnel.InstallRecoveredKey` (escrow-recovered WG key → same identity/pubkey/`/32`, no keygen; create-only; `--selftest=identity-consume -install-wg-key`). Part 2: `internal/dr` consumes the host_loss `restore_directive` into an inspectable RestorePlan (per-guest restore coords+sizing, per-drive durable_id→mount) via the AddConsumer seam — derive-and-surface, execute nothing. Re-attach wrong-disk safety = `ResolveStorageDevice` (match resolves, mismatch REFUSED — unit-proven). | ~~consume `WGPrivateKey` in restore mode~~ | the tunnel re-establishes from the recovered key (same `/32`) ✓ (unit); the host_loss directive yields the correct PLAN ✓ (unit). **Operator-gated:** the destructive in-place 9201 restore (destroy→restore-from-offsite→re-attach-by-durable_id) is operator-present + STOP-gated — the operator runs the R-consume steps (CC never does). Pre-flight green (9201 offsite-restorable, S4.1). |
 | **S6 — monitoring + isolation hardening** | endpoint-side alerting, per-peer firewall audit; ~~CGNAT smoke-test closure~~ **DONE 2026-07-04 (§7)** — mobile-carrier NAT traversal + 32-min keepalive hold proven; ~~§4.3 MTU decision~~ **RESOLVED (client MTU 1280, agent v0.65.0, §4.3)**; residual = true-CGNAT-SIM retest (low risk) | tunnel-down and peer-anomaly both alert; isolation verified adversarially |